Can you find out the remainder when 3^300 is divided by 5?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

You have two jars of chocolates labelled as P and Q. If you move one chocolate from P to Q, the number of chocolates on B will become twice the number of chocolates in A. If you move one chocolate from Q to P, the number of chocolates in both the jars will become equal.

Can you find out how many chocolates are there in P and Q respectively?

Using Only Five 5's and any mathematical operator make sum as 37

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13